Berkman, P. L. 1971. Life stress and psychological well-being: a replication of Langner's analysis in the Midtown Manhattan Study. Journal of Health and Social Behavior 12, 35-45.

Earliest reference of the term psychological well-being.The Index of Psychological Well-Being takes Negative Feelings [very lonely, depressed, bored, restless, uneasiness] and Positive Feelings [excited or interested in something, pleased about having accomplished something] into account.